Maya keymap used LMB press to select object and also used tweak event
of LMB for border select. This lead to selecting object under the cursor
before border select could start.
This could be pain when working on huge scenes.
Solved by switching selection from LMB press to release.
It looks to be non-maintained keymap anymore, this commit only resolves
keymap conflict changing snap menu to ctrl-shift-s, no more global
changes to not break muscule memory so close to release.
* made bmesh_structure.h function names more consistant.
* remove unused code in bmesh_structure.c
* removed 'Edge Flip' operator (missing from bmesh but looked into trunk feature and dont think its worth keeping).
* tagged some BMESH_TODO's
Added subdivisions shortcut for mesh editing mode to maya preset.
Not actually sure such shortcut present in Maya, but seems to be logical
to have it both object and edit modes.
Keypam for midpoint knife cutting was disabled for a while due to
midpoint toggle was moved to a model keymap and i'm not sure how to
start operator with midpoint enabled by default.
[#25045] User Preferences Input, not enough menu choices
[#26525] Saving the Maya preset and another key configs
Untangle keyconfig presets and interaction presets (maya keyconfig would set interaction setting, blender interaction would set keyconfig).
Preset menu on slash screen now displays a list of available keyconfigs (as before) but will also set the correspondant interaction presets, if it exists)
